DP-203 Design and implement data storage Practice Question
Exhibit
Refer to the exhibit.
```json
{
"type": "Microsoft.Storage/storageAccounts/blobServices/containers/immutabilityPolicies",
"apiVersion": "2021-09-01",
"name": "audit-container/policy",
"properties": {
"immutabilityPeriodSinceCreationInDays": 2555,
"allowProtectedAppendWrites": true
}
}
```You are reviewing an ARM template snippet for an Azure Blob Storage container. What is the effect of this configuration?
⚠ Common exam trap
A common mix-up: candidates confuse the 2555-day value with a 3-year period (1095 days) or misinterpret `allowProtectedAppendWrites` as blocking appends, when in fact it enables them under immutable storage.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It enforces a 7-year immutable retention policy allowing appends.
The ARM template snippet configures a time-based retention policy on the container with a retention period of 2555 days (7 years) and sets `allowProtectedAppendWrites` to true. This enables an immutable storage policy that prevents deletion or modification of existing blobs but allows new append blocks to be added to append blobs, making option C correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It enables legal hold on the container for 2555 days.
Why it's wrong here
Legal hold is a separate property; this is time-based retention.
- ✗
It blocks append writes to blobs in the container.
Why it's wrong here
allowProtectedAppendWrites is set to true, so appends are allowed.
- ✓
It enforces a 7-year immutable retention policy allowing appends.
Why this is correct
2555 days ≈ 7 years; allowProtectedAppendWrites allows log appends.
- ✗
It sets a 3-year retention policy blocking any modifications.
Why it's wrong here
2555 days is approximately 7 years.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
Go deeper
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